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Water at the rate of 0.8kg/s at 90C flows through a steel pipe with 2.5cmID and 3cm OD. The outside surface temperature of the pipe

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Water at the rate of 0.8kg/s at 90C flows through a steel pipe with 2.5cmID and 3cm OD. The outside surface temperature of the pipe is 85C, and the temperature of the surrounding air is 20C. The room pressure is 1atm, and the pipe is 15m long. How much heat is lost by free convection to the room

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